One of her volunteer caretakers at the picturesque Marina District pond discovered the injury Thursday and contacted city officials. She was treated by a veterinarian at the San Francisco Zoo and was set to be transported Thursday evening to the place of her birth, a swan-breeding operation in Pt. Reyes. There, she will be cared for and given a chance to recover.

The cause of her injury is not known, but foul play was not suspected, said Sarah Ballard, a spokeswoman for the Recreation and Park Department. There’s ”no evidence that the swan was deliberately injured,” Ballard told the City Insider.

Last fall, vandals intentionally killed Monday, the name of another swan at the lagoon whose neck was snapped. Monday’s mother, named Friday, disappeared last spring.

That left only one swan, Blanche, until Bella and her fine-feathered friend, Blue Boy, were brought to the lagoon in January from Point Reyes.

The zoo’s veterinary team will reassess Bella in two weeks to determine when she can once again grace the waters at the Palace of Fine Arts.